BQ79600-Q1_V01 datasheet(23/71 Pages) TI

No. de pieza	BQ79600-Q1

Descripción Electrónicos	BQ79600-Q1 Automotive SPI/UART Communication Interface Functional-Safety Compliant With Automatic Host Wakeup

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Fabricante Electrónico	TI [Texas Instruments]

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SPI_RDY = Z1[?

NO

Wait

t<= t8

Drop nCS, Send one Single Device Read or Stack Read

Command frame, raise nCS @2-6Mbps;

M = expected total Response bytes,

i = int(M/128), K = M- i*128;

Drop nCS, Read 128 bytes then

stop (stop SCLK, raise nCS high),

i = i -1;

Total wait time >

tWAIT_READ_MAX?

NO

YES

Comm Clear,

Reread

i > 0?

YES

Drop nCS, Read K

bytes, raise nCS

YES

Host reads

expected # of

valid data

YES

NO

Comm Clear

Finish

Reading

SPI_RDY = Z1[?

YES

NO

delay

Start

Device

Initialization

Figure 7-16. Flow Chart to Read from Device

Note

MCU shall check SPI_RDY pin at least every t8 (max service interval). t8 = 1ms at SCLK = 6MHz /

890μs at SCLK = 4MHz /550μs at SCLK = 2MHz assuming host starts to read TX FIFO right after

detecting SPI_RDY = '1 and SPI bus has 30% idle time in the process of reading 128 bytes.

• For response frame, nCS has to be toggled high after reading the last byte of data in the current buffer.

• tWAIT_READ_MAX

– stack read/single device read from stack devices, with n stack devices, request m bytes in total (payload +

overheads, from all stack devices), wait time: (n-1)*3μs*2 + m*10μs + 100μs.

– single device read from BQ79600-Q1, request m bytes , wait time: 100μs + m*10μs.

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BQ79600-Q1

SLUSDS1A – NOVEMBER 2019 – REVISED AUGUST 2020

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Product Folder Links: BQ79600-Q1

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Descripción similar - BQ79600-Q1_V01

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